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From: Warner Losh <imp@FreeBSD.org>
Date: Sun, 11 Sep 2005 04:09:44 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
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Cc: 
Subject: cvs commit: src/sys/dev/pci pci.c
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imp         2005-09-11 04:09:44 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/pci          pci.c 
  Log:
  Change hw.pci.do_powerstate from a boolean to a range.  0 means the
  same as today: do no power management.  1 means be conservative about
  what you power down (any device class that has caused problems gets
  added here).  2 means be agressive about what gets powered down (any
  device class that's fundamental to the system is here).  3 means power
  them all down, reguardless.  The default is 1.
  
  The effect in the default system is to add mass storage devices to the
  list that we don't power down.  From all the pciconf -l lists that
  I've seen for the aac and amr issue, the bad device has been a mass
  storage device class.
  
  This is an attempt at a compromise between the very small number of
  systems that have extreme issues with powerdown, and the very large
  number of systems that gain real benefits from powerdown (I get about
  20% more battery life when I attach a minimal set of drivers on my
  Sony).  Hopefully it will strike the proper balance.
  
  MFC After: 3 days (before next beta)
  
  Revision  Changes    Path
  1.297     +34 -15    src/sys/dev/pci/pci.c